IC Realtime Professional 3-D DVR/PTZ Keyboard with Network Capability - Manual (Page 21)

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5 Keyboard Control DVR
5.1 Serial Port Connection
5.1.1 RS232 Serial Port Connection
You can use one RS232 cable to connect DVR serial port and keyboard serial port together.
See Figure 5-1.
DVR address number ranges from 1 to 255，please refer to DVR manual for more information.
Figure 5-1
5.1.2 Via RS485 Connection
You can use one RS232 port can only connect with one DVR. See Figure 5-2.
You need to use RS 485 port once you want to control more than one DVRs.
You can user one standad RS485 to RS 232 box connect with DVR 232 port.
RS 485 port pins definition：
Figure 5-2
PIN1 ： RS485 B1 line
PIN2 ：RS485 A1 line
PIN3 ：RS485 B2 line
PIN4 ：RS485 A2 line
PIN5 ：RS485 B3 line
PIN6 ：RS485 A3 line
You can use if you use RS485 connection via converter. See Figure 5-3.
DVR
RS232 cable
PIN9
PIN6
PIN1 PIN2 PIN3 PIN4 PIN5 PIN6